CN105334157A - Sliding friction coefficient measure apparatus and sliding friction coefficient measure method - Google Patents
Sliding friction coefficient measure apparatus and sliding friction coefficient measure method Download PDFInfo
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Abstract
The invention discloses a sliding friction coefficient measure apparatus and a sliding friction coefficient measure method. The sliding friction coefficient measure apparatus comprises a first and a second displacement platforms, a quartz tuning fork, an excitation signal source, a tuning-fork vibration signal detector, a cantilever beam, and a displacement sensor; the excitation frequency of the excitation signal source is the resonance frequency of the quartz tuning fork; the cantilever beam is arranged on the second displacement platform, and is perpendicular to the axial direction of one tuning fork leg, and the end face of the tuning fork leg is opposite to the first surface of the free end of the cantilever beam; and the end face of the tuning fork leg is used for arrangement of a sliding member or the end face of the tuning fork leg is a sliding face, and the first surface of the free end of the cantilever beam is used for arrangement of a friction member or the first surface of the free end of the cantilever beam is a friction surface. The sliding friction coefficient measure apparatus in the invention embodiment is applicable to measure the sliding friction coefficient between small-dimension (micrometer and nanometer) friction pairs, and especially the sliding friction coefficient under a high-frequency oscillation friction condition.
Description
Technical field
The present invention relates to coefficient of sliding friction measurement mechanism and coefficient of sliding friction measuring method.
Background technology
In the rub measurement field of small dimensional material and structure, conventional method has surface force apparatus and Scanning probe technique, comprises scanning tunnel microscope, atomic force microscope, friction force microscope etc.These technology can be used to measured surface microscopic behavior mechanical behavior, are applicable to the researchs such as micro tribology, Micro scratching and nanometer wearing and tearing.But the requirement of these technology to sample and environment is very high, the equipment price related to is expensive, and not easy to operate, and the relative sliding frequency of friction pair is lower especially in the measurements.
Summary of the invention
The present invention is intended to solve one of technical matters in correlation technique at least to a certain extent.For this reason, the present invention proposes a kind of coefficient of sliding friction measurement mechanism, described coefficient of sliding friction measurement mechanism can measure the coefficient of sliding friction between small scale (micron, nanometer) friction pair, the coefficient of sliding friction especially under higher-order of oscillation friction condition.
The present invention also proposes a kind of coefficient of sliding friction measuring method.
The coefficient of sliding friction measurement mechanism of embodiment comprises according to a first aspect of the present invention: the first displacement platform and the second displacement platform, and at least one in described first displacement platform and described second displacement platform is arranged movably along first direction; Quartz tuning-fork, described quartz tuning-fork is located on described first displacement platform, and described quartz tuning-fork has input lead, output lead and tuning fork leg; Exciting signal source, described exciting signal source is connected with described input lead by wire, and the excitation frequency of described exciting signal source is the resonant frequency of described quartz tuning-fork; For measuring the tuning fork vibration signal detector of the amplitude of described quartz tuning-fork; Semi-girder, described semi-girder is located on described second displacement platform, described semi-girder is perpendicular to the axis of described tuning fork leg, the end face of described tuning fork leg is relative with the first surface of the free end of described semi-girder, the end face of wherein said tuning fork leg is slipping plane for arranging the end face of sliding members or described tuning fork leg, and the first surface of the free end of described semi-girder is rubbing surface for arranging the first surface of the free end of friction element or described semi-girder; With the displacement transducer of the amount of deflection of the free end for measuring described semi-girder.
May be used for measuring the coefficient of sliding friction between small scale (micron, nanometer) friction pair, the coefficient of sliding friction especially under higher-order of oscillation friction condition according to the coefficient of sliding friction measurement mechanism of the embodiment of the present invention.
In addition, coefficient of sliding friction measurement mechanism according to the above embodiment of the present invention can also have following additional technical characteristic:
According to one embodiment of present invention, at least one in described first displacement platform and described second displacement platform is arranged along the vertical direction movably, described semi-girder is positioned at the below of described quartz tuning-fork, the lower surface of wherein said tuning fork leg is slipping plane for arranging the lower surface of sliding members or described tuning fork leg, and the upper surface of the free end of described semi-girder is rubbing surface for arranging the upper surface of the free end of friction element or described semi-girder.
According to one embodiment of present invention, each in described first displacement platform and described second displacement platform is arranged along the vertical direction movably, and the Minimum sliding distance of described first displacement platform is greater than the Minimum sliding distance of described second displacement platform.
According to one embodiment of present invention, described tuning fork vibration signal detector is Laser Doppler Velocimeter, and described Laser Doppler Velocimeter is relative with described tuning fork leg, and described tuning fork leg is unsettled.
According to one embodiment of present invention, described tuning fork vibration signal detector is oscillograph, and described oscillograph is connected with described output lead by wire.
According to one embodiment of present invention, institute's displacement sensors is located on described second displacement platform.
The coefficient of sliding friction measuring method of embodiment comprises the following steps according to a second aspect of the present invention: A) end face of tuning fork leg of quartz tuning-fork and the first surface of the free end of semi-girder are oppositely arranged, and make described semi-girder perpendicular to the axis of the tuning fork leg of described quartz tuning-fork so that the direction of vibration of described quartz tuning-fork is parallel to the axis of described semi-girder, the end face wherein arranging the tuning fork leg of sliding members or described quartz tuning-fork on the end face of the tuning fork leg of described quartz tuning-fork is slipping plane, the first surface that the first surface of the free end of described semi-girder arranges the free end of friction element or described semi-girder is rubbing surface, B) described quartz tuning-fork is encouraged at the resonant frequency place of described quartz tuning-fork, C) at least one in described quartz tuning-fork and described semi-girder is moved, to make one in the end face of the tuning fork leg of described quartz tuning-fork and the slipping plane of described sliding members to contact with in the first surface of the free end of described semi-girder and the rubbing surface of described friction element, D) at described step C) carry out before and carry out the rear amplitude measuring the tuning fork leg of described quartz tuning-fork respectively, at described step C) carry out the amount of deflection of the described semi-girder of rear measurement, the coefficient of sliding friction of described slipping plane and described rubbing surface is calculated according to described amplitude and described amount of deflection.
According to one embodiment of present invention, at described step D) in, calculate the friction force between described slipping plane and described rubbing surface according to the following formula:
Wherein, H is friction force,
for the ratio of damping of quartz tuning-fork, k is the rigidity of quartz tuning-fork, and Q is the quality factor of quartz tuning-fork, and Ω is the resonance circular frequency of quartz tuning-fork, R
0for at described step C) carry out the measured value of front described amplitude, R is at described step C) carry out the measured value of rear described amplitude,
Calculate the normal pressure of described slipping plane and described rubbing surface according to the following formula:
N＝kδ
Wherein, N is normal pressure, and δ is the measured value of described amount of deflection,
Calculate the coefficient of sliding friction of described slipping plane and described rubbing surface according to the following formula:
Wherein, μ is the coefficient of sliding friction.
According to one embodiment of present invention, at described step B) carry out before, frequency sweep operation is carried out to determine the resonance frequency value of the reality of described quartz tuning-fork to described quartz tuning-fork.
Accompanying drawing explanation
Fig. 1 is the structural representation of the coefficient of sliding friction measurement mechanism according to the embodiment of the present invention;
Fig. 2 is the process flow diagram of the coefficient of sliding friction measuring method according to the embodiment of the present invention;
Fig. 3 is the schematic diagram of the measurement result of coefficient of sliding friction measurement mechanism according to the embodiment of the present invention.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the present invention, and can not limitation of the present invention be interpreted as.
Below with reference to the accompanying drawings coefficient of sliding friction measurement mechanism 10 according to the embodiment of the present invention is described.As shown in Figure 1, according to the coefficient of sliding friction measurement mechanism 10 of the embodiment of the present invention comprise the first displacement platform 101, second displacement platform 102, quartz tuning-fork 103, exciting signal source 104, for measuring the displacement transducer (not shown) of the tuning fork vibration signal detector of the amplitude of quartz tuning-fork 103, semi-girder 106 and the amount of deflection for the free end of measuring semi-girder 106.
At least one in first displacement platform 101 and the second displacement platform 102 is arranged movably along first direction.Quartz tuning-fork 103 is located on the first displacement platform 101, and quartz tuning-fork 103 has input lead 1032, output lead 1033 and tuning fork leg 1031.Exciting signal source 104 is connected with this input lead 1032 by wire, and the excitation frequency of exciting signal source 104 is the resonant frequency of quartz tuning-fork 103.Semi-girder 106 is located on the second displacement platform 102, and semi-girder 106 is perpendicular to the axis of tuning fork leg 1031, and the end face of tuning fork leg 1031 is relative with the first surface of the free end of semi-girder 106.Wherein, the end face of tuning fork leg 1031 is slipping plane for arranging the end face of sliding members or tuning fork leg 1031, and the first surface of the free end of semi-girder 106 is rubbing surface for arranging the first surface of the free end of friction element or semi-girder 106.
Below with reference to Fig. 2, the coefficient of sliding friction measuring method according to the embodiment of the present invention is described.Coefficient of sliding friction measuring method according to the embodiment of the present invention comprises the following steps:
A) first surface of the end face of the tuning fork leg 1031 of quartz tuning-fork 103 and the free end of semi-girder 106 is oppositely arranged, and make semi-girder 106 perpendicular to the axis of the tuning fork leg 1031 of quartz tuning-fork 103 so that the direction of vibration of quartz tuning-fork 103 is parallel to the axis of semi-girder 106, the end face wherein arranging the tuning fork leg 1031 of sliding members or quartz tuning-fork 103 on the end face of the tuning fork leg 1031 of quartz tuning-fork 103 is slipping plane, and the first surface that the first surface of the free end of semi-girder 106 arranges the free end of friction element or semi-girder 106 is rubbing surface;
B) at the resonant frequency place of quartz tuning-fork 103 excitation quartz tuning-fork 103;
C) at least one in mobile quartz tuning-fork 103 and semi-girder 106, to make one in the end face of tuning fork leg 1031 of quartz tuning-fork 103 and the slipping plane of this sliding members to contact with in the first surface of the free end of semi-girder 106 and the rubbing surface of this friction element, to form friction pair 107;
D) in step C) carry out before and carry out the rear amplitude of tuning fork leg 1031 measuring quartz tuning-fork 103 respectively, in step C) carry out the amount of deflection of rear measurement semi-girder 106, the coefficient of sliding friction of slipping plane and rubbing surface is calculated according to this amplitude and this amount of deflection.
May be used for measuring the coefficient of sliding friction between small scale (micron, nanometer) friction pair 107, the coefficient of sliding friction especially under higher-order of oscillation friction condition according to the coefficient of sliding friction measurement mechanism 10 of the embodiment of the present invention and coefficient of sliding friction measuring method.Quartz tuning-fork 103 is utilized to measure the side-friction of friction pair 107 in the linear relationship between the amplitude variations and side-friction at resonant frequency place according to the coefficient of sliding friction measurement mechanism 10 of the embodiment of the present invention and coefficient of sliding friction measuring method, utilize the linear relationship between the amount of deflection of the free end of semi-girder 106 and external force to measure the normal pressure of this friction pair 107 simultaneously, by side-friction and the normal pressure of acquisition, calculate the coefficient of sliding friction of friction pair 107.Dynamic friction coefficient between the material being mainly used in micron, nanoscale according to the coefficient of sliding friction measurement mechanism 10 of the embodiment of the present invention and coefficient of sliding friction measuring method and frictional behaviour thereof are measured.And the dynamic friction coefficient between the material that also may be used for large scale according to the coefficient of sliding friction measurement mechanism 10 of the embodiment of the present invention and coefficient of sliding friction measuring method and frictional behaviour thereof are measured.
Can under high frequency slip condition according to the coefficient of sliding friction measurement mechanism 10 of the embodiment of the present invention and coefficient of sliding friction measuring method, measure friction force and the normal pressure of the friction pair 107 formed by small dimensional material and structure simultaneously, and then calculate the coefficient of sliding friction.
Specifically, by modifying the physical dimension of the free end of semi-girder 106, the measurement from nanometer to the sample of submillimeter yardstick can be adapted to.And, by selecting the resonant frequency of the not same order of different quartz tuning-forks 103 or same quartz tuning-fork 103, under can be implemented in high-speed motion speed, the measurement of the kinetic friction coefficient of small dimensional material and structure.
Therefore, according to the coefficient of sliding friction measurement mechanism 10 of the embodiment of the present invention have configuration simply, the advantage such as more easy to operate.
As shown in Figure 1, in some embodiments of the invention, coefficient of sliding friction measurement mechanism 10 comprise the first displacement platform 101, second displacement platform 102, quartz tuning-fork 103, exciting signal source 104, for measuring the displacement transducer of the tuning fork vibration signal detector of the amplitude of quartz tuning-fork 103, semi-girder 106 and the amount of deflection for the free end of measuring semi-girder 106.
Advantageously, displacement transducer is located on the second displacement platform 102.Wherein, when the amount of deflection of the free end of semi-girder 106 and micro-meter scale quite or larger time, this displacement transducer can be substituted with the second displacement platform 102.
In one embodiment of the invention, at least one in the first displacement platform 101 and the second displacement platform 102 is arranged along the vertical direction movably, and semi-girder 106 is positioned at the below of quartz tuning-fork 103.Wherein, the lower surface of tuning fork leg 1031 is slipping plane for arranging the lower surface of this sliding members or tuning fork leg 1031, and the upper surface of the free end of semi-girder 106 is rubbing surface for arranging the upper surface of the free end of this friction element or semi-girder 106.Above-below direction is as shown in the arrow A in Fig. 1.
Advantageously, each in the first displacement platform 101 and the second displacement platform 102 is arranged along the vertical direction movably, and the Minimum sliding distance of the first displacement platform 101 is greater than the Minimum sliding distance of the second displacement platform 102.In other words, the first displacement platform 101 is utilized to carry out coarse adjustment, make tuning fork leg 1031 close to semi-girder 106, then the second displacement platform 102 is utilized to carry out accurate adjustment, to make the end face of tuning fork leg 1031 of quartz tuning-fork 103 contact with in the first surface of the free end of semi-girder 106 and the rubbing surface of this friction element with the slipping plane of this sliding members.
Specifically, when the coefficient of sliding friction of measurement first material and the second material, this sliding members can be made to be made up of in this first material and this second material, and this friction element is made up of another in this first material and this second material.Wherein, this sliding members is located on the lower surface of tuning fork leg 1031, and this friction element is located on the upper surface of the free end of semi-girder 106, to form friction pair 107.
If the material of the tuning fork leg 1031 of quartz tuning-fork 103 is identical with in this second material with this first material, then the lower surface of the tuning fork leg 1031 of quartz tuning-fork 103 can be utilized as slipping plane.Advantageously, semi-girder 106 is made up, thus without the need to producing separately this friction element of another in this first material and this second material.In other words, semi-girder 106 and this friction element form as one.
The material of semi-girder 106 and geometric configuration can unrestricted choice as required.Such as, semi-girder 106 is the tungsten filament of 80 microns for diameter, the length of semi-girder 106 can be selected to be 2 cm, to realize enough large distortion.The transverse force (being namely applied to the normal pressure on friction pair 107) that the free end of semi-girder 106 is subject to is directly proportional to the transverse deflection of semi-girder 106, after adopting this deflection value of this displacement sensor, can obtain the size of this transverse force.
Quartz tuning-fork 103 can be business tuning fork.Wherein, quartz tuning-fork 103 has two tuning fork legs 1031, input lead 1032 is connected (being such as electrically connected) with the two panels metallic film on the surface of each tuning fork leg 1031 to form an electrode, and output lead 1033 is connected (being such as electrically connected) to form another electrode with the other two panels metallic film on the surface of each tuning fork leg 1031.
When reality uses, the resonant frequency of quartz tuning-fork 103 can offset.In order to improve the degree of accuracy of measurement, (such as before the resonant frequency place of quartz tuning-fork 103 excitation quartz tuning-fork 103) can utilize oscillograph and signal generator to carry out frequency sweep operation to quartz tuning-fork 103, to determine the resonance frequency value of the reality of quartz tuning-fork 103 before measuring.
Exciting signal source 104 uses signal generator, and exciting signal source 104 is connected with the input lead 1032 of quartz tuning-fork 103 by wire.The excitation frequency of exciting signal source 104 is the resonant frequency (such as first order resonance frequency, second-order resonance frequency, third order resonance frequency) of quartz tuning-fork 103.
One in the end face of tuning fork leg 1031 and the slipping plane of this sliding members of quartz tuning-fork 103 to contact with in the first surface of the free end of semi-girder 106 and the rubbing surface of this friction element before and after, measure the amplitude of the end of tuning fork leg 1031.
In an example of the present invention, tuning fork vibration signal detector is Laser Doppler Velocimeter 1051, and Laser Doppler Velocimeter 1051 is relative with tuning fork leg 1031, and tuning fork leg 1031 is unsettled.Laser Doppler Velocimeter 1051 directly can measure the amplitude of the end of the tuning fork leg 1031 of quartz tuning-fork 103.Specifically, when adopting Laser Doppler Velocimeter 1051 to measure amplitude, exciting signal source 104 is connected with the input lead 1032 of quartz tuning-fork 103, and quartz tuning-fork 103 is encouraged at resonant frequency place, the output lead 1033 of quartz tuning-fork 103 is set to disconnect, and is not connected with external circuitry.
In another example of the present invention, tuning fork vibration signal detector is oscillograph 1052, and oscillograph 1052 is connected with the output lead 1033 of quartz tuning-fork 103 by wire.The voltage magnitude of the tuning fork leg 1031 of quartz tuning-fork 103 measured by oscillograph 1052, the displacement amplitude linear correlation of this voltage magnitude and tuning fork leg 1031.
The amplitude that this tuning fork vibration signal detector measurement obtains and the transverse force that quartz tuning-fork 103 is subject to (i.e. friction pair 107 be subject to friction force) are linear, according to this linear relationship, real-time friction force size can be obtained by measuring the amplitude variations obtained.
In examples more of the present invention, in step D) in, calculate the friction force between this slipping plane and this rubbing surface according to the following formula:
Wherein, H is friction force,
for the ratio of damping of quartz tuning-fork 103, k is the rigidity of quartz tuning-fork 103, and Q is the quality factor of quartz tuning-fork 103, and Ω is the resonance circular frequency of quartz tuning-fork 103, R
0for in step C) carry out the measured value of the amplitude of front tuning fork leg 1031, R is in step C) carry out the measured value of the amplitude of rear tuning fork leg 1031.
Calculate the normal pressure of this slipping plane and this rubbing surface according to the following formula:
N＝kδ
Wherein, N is normal pressure, and δ is the measured value of amount of deflection.
Calculate the coefficient of sliding friction of this slipping plane and this rubbing surface according to the following formula:
Wherein, μ is the coefficient of sliding friction.
As shown in Figure 3, R1 is in the end face of tuning fork leg 1031 of quartz tuning-fork 103 and the slipping plane of this sliding members when just having started to contact with in the first surface of the free end of semi-girder 106 and the rubbing surface of this friction element, the measured value of the amplitude of tuning fork leg 1031.
In describing the invention, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", " outward ", " clockwise ", " counterclockwise ", " axis ", " radial direction ", orientation or the position relationship of the instruction such as " circumference " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore limitation of the present invention can not be interpreted as.
In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technical characteristic.Thus, be limited with " first ", the feature of " second " can express or impliedly comprise at least one this feature.In describing the invention, the implication of " multiple " is at least two, such as two, three etc., unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, the term such as term " installation ", " being connected ", " connection ", " fixing " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or integral; Can be mechanical connection, also can be electrical connection or each other can communication; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals or the interaction relationship of two elements, unless otherwise clear and definite restriction.For the ordinary skill in the art, above-mentioned term concrete meaning in the present invention can be understood as the case may be.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score can be that the first and second features directly contact, or the first and second features are by intermediary indirect contact.And, fisrt feature second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or only represent that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " below " and " below " can be fisrt feature immediately below second feature or tiltedly below, or only represent that fisrt feature level height is less than second feature.
In the description of this instructions, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term not must for be identical embodiment or example.And the specific features of description, structure, material or feature can combine in one or more embodiment in office or example in an appropriate manner.In addition, when not conflicting, the feature of the different embodiment described in this instructions or example and different embodiment or example can carry out combining and combining by those skilled in the art.
Although illustrate and describe embodiments of the invention above, be understandable that, above-described embodiment is exemplary, can not be interpreted as limitation of the present invention, and those of ordinary skill in the art can change above-described embodiment within the scope of the invention, revises, replace and modification.
Claims (9)
1. a coefficient of sliding friction measurement mechanism, is characterized in that, comprising:
First displacement platform and the second displacement platform, at least one in described first displacement platform and described second displacement platform is arranged movably along first direction;
Quartz tuning-fork, described quartz tuning-fork is located on described first displacement platform, and described quartz tuning-fork has input lead, output lead and tuning fork leg; Exciting signal source, described exciting signal source is connected with described input lead by wire, and the excitation frequency of described exciting signal source is the resonant frequency of described quartz tuning-fork;
For measuring the tuning fork vibration signal detector of the amplitude of described quartz tuning-fork;
Semi-girder, described semi-girder is located on described second displacement platform, described semi-girder is perpendicular to the axis of described tuning fork leg, the end face of described tuning fork leg is relative with the first surface of the free end of described semi-girder, the end face of wherein said tuning fork leg is slipping plane for arranging the end face of sliding members or described tuning fork leg, and the first surface of the free end of described semi-girder is rubbing surface for arranging the first surface of the free end of friction element or described semi-girder; With
For measuring the displacement transducer of the amount of deflection of the free end of described semi-girder.
2. coefficient of sliding friction measurement mechanism according to claim 1, it is characterized in that, at least one in described first displacement platform and described second displacement platform is arranged along the vertical direction movably, described semi-girder is positioned at the below of described quartz tuning-fork, the lower surface of wherein said tuning fork leg is slipping plane for arranging the lower surface of sliding members or described tuning fork leg, and the upper surface of the free end of described semi-girder is rubbing surface for arranging the upper surface of the free end of friction element or described semi-girder.
3. coefficient of sliding friction measurement mechanism according to claim 2, it is characterized in that, each in described first displacement platform and described second displacement platform is arranged along the vertical direction movably, and the Minimum sliding distance of described first displacement platform is greater than the Minimum sliding distance of described second displacement platform.
4. coefficient of sliding friction measurement mechanism according to claim 1, is characterized in that, described tuning fork vibration signal detector is Laser Doppler Velocimeter, and described Laser Doppler Velocimeter is relative with described tuning fork leg, and described tuning fork leg is unsettled.
5. coefficient of sliding friction measurement mechanism according to claim 1, is characterized in that, described tuning fork vibration signal detector is oscillograph, and described oscillograph is connected with described output lead by wire.
6. coefficient of sliding friction measurement mechanism according to claim 1, is characterized in that, institute's displacement sensors is located on described second displacement platform.
7. a coefficient of sliding friction measuring method, is characterized in that, comprises the following steps:
A) end face of tuning fork leg of quartz tuning-fork and the first surface of the free end of semi-girder are oppositely arranged, and make described semi-girder perpendicular to the axis of the tuning fork leg of described quartz tuning-fork so that the direction of vibration of described quartz tuning-fork is parallel to the axis of described semi-girder, the end face wherein arranging the tuning fork leg of sliding members or described quartz tuning-fork on the end face of the tuning fork leg of described quartz tuning-fork is slipping plane, and the first surface that the first surface of the free end of described semi-girder arranges the free end of friction element or described semi-girder is rubbing surface;
B) described quartz tuning-fork is encouraged at the resonant frequency place of described quartz tuning-fork;
C) at least one in described quartz tuning-fork and described semi-girder is moved, to make one in the end face of the tuning fork leg of described quartz tuning-fork and the slipping plane of described sliding members to contact with in the first surface of the free end of described semi-girder and the rubbing surface of described friction element;
D) at described step C) carry out before and carry out the rear amplitude measuring the tuning fork leg of described quartz tuning-fork respectively, at described step C) carry out the amount of deflection of the described semi-girder of rear measurement, the coefficient of sliding friction of described slipping plane and described rubbing surface is calculated according to described amplitude and described amount of deflection.
8. coefficient of sliding friction measuring method according to claim 7, is characterized in that, at described step D) in, calculate the friction force between described slipping plane and described rubbing surface according to the following formula:
Wherein, H is friction force,
for the ratio of damping of quartz tuning-fork, k is the rigidity of quartz tuning-fork, and Q is the quality factor of quartz tuning-fork, and Ω is the resonance circular frequency of quartz tuning-fork, R
0for at described step C) carry out the measured value of front described amplitude, R is at described step C) carry out the measured value of rear described amplitude,
Calculate the normal pressure of described slipping plane and described rubbing surface according to the following formula:
N＝kδ
Wherein, N is normal pressure, and δ is the measured value of described amount of deflection,
Calculate the coefficient of sliding friction of described slipping plane and described rubbing surface according to the following formula:
Wherein, μ is the coefficient of sliding friction.
9. the coefficient of sliding friction measuring method according to any one of claim 1-8, is characterized in that, at described step B) carry out before, frequency sweep operation is carried out to determine the resonance frequency value of the reality of described quartz tuning-fork to described quartz tuning-fork.
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| CN106568706A (en) * | 2016-11-10 | 2017-04-19 | 武汉海润工程设备有限公司 | Sliding material friction performance evaluating method for bridge and building shock isolation devices |
| CN107014747A (en) * | 2017-05-26 | 2017-08-04 | 清华大学 | A kind of rock mass discontinuity dynamic friction experimental system based on shake table |
| CN107243926A (en) * | 2017-07-25 | 2017-10-13 | 苏州穿山甲机器人股份有限公司 | The friction measurement method of electrically-driven robot |
| CN107576610A (en) * | 2017-10-29 | 2018-01-12 | 吉林大学 | A kind of more measuring physicals and detection method based on mantle friction |
| CN108955956A (en) * | 2018-07-12 | 2018-12-07 | 北京大学 | Frictional resistance measuring system and method based on flexible micro- beam |
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| CN106568706A (en) * | 2016-11-10 | 2017-04-19 | 武汉海润工程设备有限公司 | Sliding material friction performance evaluating method for bridge and building shock isolation devices |
| CN106568706B (en) * | 2016-11-10 | 2017-10-10 | 武汉海润工程设备有限公司 | A kind of bridge and architectural vibration-insulation device sliding material frictional behaviour assessment method |
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| CN107014747B (en) * | 2017-05-26 | 2019-09-27 | 清华大学 | A kind of rock mass discontinuity dynamic friction experimental system based on shake table |
| CN107243926A (en) * | 2017-07-25 | 2017-10-13 | 苏州穿山甲机器人股份有限公司 | The friction measurement method of electrically-driven robot |
| CN107243926B (en) * | 2017-07-25 | 2019-11-29 | 苏州穿山甲机器人股份有限公司 | The friction measurement method of electrically-driven robot |
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